Kirby: Right Back At Ya! "Shell-Shocked" (found English dub of anime episode; 2005-2006)
From The Lost Media Wiki
"Shell-Shocked" was the 88th episode of Kirby: Right Back At Ya!. It centered around Escargoon's shell breaking.
The episode was supposed to air on June 11 2005, but was pre-empted by "This Week's Baseball". The episode didn't properly air until 2006 and was ultimately lost until Youtuber "Operation Hoshi no Kaabii" uploaded it on September 26th 2015. The dub and a promo for it can be found below.